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1 | package DBIx::Class::Schema::Loader::SQLite; |
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2 | |
3 | use strict; |
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4 | use base 'DBIx::Class::Schema::Loader::Generic'; |
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5 | use Text::Balanced qw( extract_bracketed ); |
6 | use DBI; |
7 | use Carp; |
8 | |
9 | =head1 NAME |
10 | |
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11 | DBIx::Class::Schema::Loader::SQLite - DBIx::Class::Schema::Loader SQLite Implementation. |
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12 | |
13 | =head1 SYNOPSIS |
14 | |
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15 | use DBIx::Class::Schema::Loader; |
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16 | |
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17 | # $loader is a DBIx::Class::Schema::Loader::SQLite |
18 | my $loader = DBIx::Class::Schema::Loader->new( |
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19 | dsn => "dbi:SQLite:dbname=/path/to/dbfile", |
20 | namespace => "Data", |
21 | ); |
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22 | |
23 | =head1 DESCRIPTION |
24 | |
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25 | See L<DBIx::Class::Schema::Loader>. |
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26 | |
27 | =cut |
28 | |
29 | sub _db_classes { |
30 | return qw/DBIx::Class::PK::Auto::SQLite/; |
31 | } |
32 | |
33 | sub _relationships { |
34 | my $self = shift; |
35 | foreach my $table ( $self->tables ) { |
36 | |
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37 | my $dbh = $self->{_storage}->dbh; |
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38 | my $sth = $dbh->prepare(<<""); |
39 | SELECT sql FROM sqlite_master WHERE tbl_name = ? |
40 | |
41 | $sth->execute($table); |
42 | my ($sql) = $sth->fetchrow_array; |
43 | $sth->finish; |
44 | |
45 | # Cut "CREATE TABLE ( )" blabla... |
46 | $sql =~ /^[\w\s]+\((.*)\)$/si; |
47 | my $cols = $1; |
48 | |
49 | # strip single-line comments |
50 | $cols =~ s/\-\-.*\n/\n/g; |
51 | |
52 | # temporarily replace any commas inside parens, |
53 | # so we don't incorrectly split on them below |
54 | my $cols_no_bracketed_commas = $cols; |
55 | while ( my $extracted = |
56 | ( extract_bracketed( $cols, "()", "[^(]*" ) )[0] ) |
57 | { |
58 | my $replacement = $extracted; |
59 | $replacement =~ s/,/--comma--/g; |
60 | $replacement =~ s/^\(//; |
61 | $replacement =~ s/\)$//; |
62 | $cols_no_bracketed_commas =~ s/$extracted/$replacement/m; |
63 | } |
64 | |
65 | # Split column definitions |
66 | for my $col ( split /,/, $cols_no_bracketed_commas ) { |
67 | |
68 | # put the paren-bracketed commas back, to help |
69 | # find multi-col fks below |
70 | $col =~ s/\-\-comma\-\-/,/g; |
71 | |
72 | # CDBI doesn't have built-in support multi-col fks, so ignore them |
73 | next if $col =~ s/^\s*FOREIGN\s+KEY\s*//i && $col =~ /^\([^,)]+,/; |
74 | |
75 | # Strip punctuations around key and table names |
76 | $col =~ s/[()\[\]'"]/ /g; |
77 | $col =~ s/^\s+//gs; |
78 | |
79 | # Grab reference |
80 | if ( $col =~ /^(\w+).*REFERENCES\s+(\w+)\s*(\w+)?/i ) { |
81 | chomp $col; |
82 | warn qq/\# Found foreign key definition "$col"\n\n/ |
83 | if $self->debug; |
84 | eval { $self->_belongs_to_many( $table, $1, $2, $3 ) }; |
85 | warn qq/\# belongs_to_many failed "$@"\n\n/ |
86 | if $@ && $self->debug; |
87 | } |
88 | } |
89 | } |
90 | } |
91 | |
92 | sub _tables { |
93 | my $self = shift; |
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94 | my $dbh = $self->{_storage}->dbh; |
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95 | my $sth = $dbh->prepare("SELECT * FROM sqlite_master"); |
96 | $sth->execute; |
97 | my @tables; |
98 | while ( my $row = $sth->fetchrow_hashref ) { |
99 | next unless lc( $row->{type} ) eq 'table'; |
100 | push @tables, $row->{tbl_name}; |
101 | } |
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102 | return @tables; |
103 | } |
104 | |
105 | sub _table_info { |
106 | my ( $self, $table ) = @_; |
107 | |
108 | # find all columns. |
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109 | my $dbh = $self->{_storage}->dbh; |
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110 | my $sth = $dbh->prepare("PRAGMA table_info('$table')"); |
111 | $sth->execute(); |
112 | my @columns; |
113 | while ( my $row = $sth->fetchrow_hashref ) { |
114 | push @columns, $row->{name}; |
115 | } |
116 | $sth->finish; |
117 | |
118 | # find primary key. so complex ;-( |
119 | $sth = $dbh->prepare(<<'SQL'); |
120 | SELECT sql FROM sqlite_master WHERE tbl_name = ? |
121 | SQL |
122 | $sth->execute($table); |
123 | my ($sql) = $sth->fetchrow_array; |
124 | $sth->finish; |
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125 | my ($primary) = $sql =~ m/ |
126 | (?:\(|\,) # either a ( to start the definition or a , for next |
127 | \s* # maybe some whitespace |
128 | (\w+) # the col name |
129 | [^,]* # anything but the end or a ',' for next column |
130 | PRIMARY\sKEY/sxi; |
131 | my @pks; |
132 | |
133 | if ($primary) { |
134 | @pks = ($primary); |
135 | } |
136 | else { |
137 | my ($pks) = $sql =~ m/PRIMARY\s+KEY\s*\(\s*([^)]+)\s*\)/; |
138 | @pks = split( m/\s*\,\s*/, $pks ) if $pks; |
139 | } |
140 | return ( \@columns, \@pks ); |
141 | } |
142 | |
143 | =head1 SEE ALSO |
144 | |
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145 | L<DBIx::Schema::Class::Loader> |
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146 | |
147 | =cut |
148 | |
149 | 1; |